Patent US3596031A successfully refreshed from Google Patents.
US3596031A
Expired / Lapsed
US
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Contact material for electronic musical instruments and the method for mfg. the same
Assignee: Nippon Gakki Co Ltd
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Filing: 1969-08-05
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Granted: 1971-07-27
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Expires: 1989-08-05
Abstract
Abstract By mixing and dispersing a carbon black, a curing agent, and other compounding ingredients in an uncured rubber in the form of a solution of relatively low viscosity by agitating means which imparts substantially no shear-force to these materials and by evaporating off the solvent of the rubber solution, an electroconductive uncured rubber material of very uniform and reproducibly constant product quality can be produced.
Inventors
- 👤 Yoshiaki Murakoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:30
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; G; G10; G10H; G10H1/00; G10H1/02; G10H1/04; G10H1/053; G10H1/055; G10H1/0558; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/029
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
In an electric contact for electronic musical instruments the improvement comprising cured rubber material made from methylvinyl-polysiloxane gum, and from approximately 30 to 50 parts by weight per hundred parts by weight of rubber, of carbon black of a furnace black quality uniformly dispersed in said base rubber material for imparting electroconductivity thereto, said furnace carbon black having oil adsorption quantities of from approximately 0.8 to 1.6 ml./gram and iodine adsorption quantities of approximately 110 mg/gram or less.
Claim 2
Dependent Claim
78 words
In an electric contact for electronic musical instruments the improvement comprising cured rubber material made from methylvinyl-polysiloxane gum, and from approximately 30 to 50 parts by weight per hundred parts by weight of rubber, of carbon black of a furnace black quality uniformly dispersed in said base rubber material for imparting electroconductivity thereto, said furnace carbon black having oil adsorption quantities of from approximately 0.8 to 1.6 ml./gram and iodine adsorption quantities of approximately 110 mg/gram or less.
Claim 3
Dependent Claim
49 words
The improvement of claim 1, in which the cured rubber has a resistivity of from approximately 1 to 30 ohm-m, and a durometer hardness number of from 45 to 70 In accordance with ASTM Designation D-676 at a temperature of 20* C. and a relative humidity of 65 percent.
Claim 4
Dependent Claim
29 words
The improvement of claim 1, in which carbon black having saturation portion in its characteristic curve relating to resistivity to carbon black percentage is used as said carbon black.
Claim 5
Independent Claim
111 words
A method for producing an producing an electrical contact rubber material, comprising steps of blending 30 to 50 parts by weight of carbon black and 0.5 to 2 parts by weight of a curing agent with 100 parts by weight of silicon gum dissolved in 150 parts by weight of a solvent, agitating the whole mixture for uniform dispersion of the carbon black and the curing agent in the silicon gum solution, then causing the solvent to be evaporated off from the mixture at a temperature below the curing temperature of the rubber to take place due to a coexisting curing agent, and subjecting the whole batch to the curing treatment.
Claim 6
Independent Claim
111 words
A method for producing an producing an electrical contact rubber material, comprising steps of blending 30 to 50 parts by weight of carbon black and 0.5 to 2 parts by weight of a curing agent with 100 parts by weight of silicon gum dissolved in 150 parts by weight of a solvent, agitating the whole mixture for uniform dispersion of the carbon black and the curing agent in the silicon gum solution, then causing the solvent to be evaporated off from the mixture at a temperature below the curing temperature of the rubber to take place due to a coexisting curing agent, and subjecting the whole batch to the curing treatment.
Claim 7
Dependent Claim
30 words
A method as claimed in claim 4, in which the curing agent is organic peroxides for the silicon gum selected from group consisting of dicumyl peroxide and 2.5-dimethyl-2.5 (tetrabutyl peroxy)-dihexane.
Claim 8
Dependent Claim
31 words
The improvement of claim 1 wherein said contact comprises a copper wire as a core for the contact and electroconductive cured rubber material as defined in claim 1 surrounding said core.
Claim 9
Dependent Claim
15 words
The improvement of claim 6, in which the transverse configuration of said contact is circular.
Claim 10
Dependent Claim
15 words
The improvement of claim 6, in which the transverse configuration of said contact is polygonal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |